XML 47 R35.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Fair Values on Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Fair value of financial assets and liabilities |  |
Total financial assets | $ 49,248 | $ 58,059
Money market funds |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 6,603 | 8,991
United States government agency securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 14,770 | 8,029
United States government agency securities | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 14,770 | 8,029
Corporate debt securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 27,875 | 37,087
Marketable equity securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets |  | 3,952
Level 1 |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 6,603 | 12,943
Level 1 | Money market funds |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 6,603 | 8,991
Level 1 | Marketable equity securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets |  | 3,952
Level 2 |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 42,645 | 45,116
Level 2 | United States government agency securities | Short-term Investments |  |
Fair value of financial assets and liabilities |  |
Total financial assets | 14,770 | 8,029
Level 2 | Corporate debt securities |  |
Fair value of financial assets and liabilities |  |
Total financial assets | $ 27,875 | $ 37,087

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
Name: | us-gaap_AvailableForSaleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_ShortTermInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |